[libvirt] libvirt 2.3.0 and later versions hanging

[Paul Gildea]

Hi, I am starting a libvritd process when booting up an embedded networking
system via python, like so:
subprocess.Popen(["libvirtd","-d"],stdout=subprocess.PIPE,stderr=subprocess.PIPE)

This runs and works fine for version 1.2.20. However after I upgraded to
2.3.0 I started noticing an intermittent bug. Sometimes my CLI will hang
when libvirtd is starting (most of the time it starts fine).

I ssh'd in and had a look around.  libvirtd had a second process entry:
[root at trx-r2 log]# ps ax | grep libvirt
  826 ?        Sl     0:00 libvirtd -d
  843 ?        S      0:00 libvirtd -d
  869 pts/0    S+     0:00 grep libvirt

Using strace I could see the second entry was blocking (FUTEX). Kill
libvirtd processes and the boot continues as normal.  I updated libvirt to
the latest version and this still happens. To confirm I downgraded to
1.2.20 again and everything works smoothly. Any idea of what may have
changed to cause this, pointers for me as to where to have a look?

Thanks,

--
Paul
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/libvir-list/attachments/20170330/cda60f69/attachment-0001.htm>